13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...

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Wallis Lake Estuary Management Plan E.4 Management Area A, C Management Objective Protect seagrass beds from being overgrown and smothered by other aquatic macro-algae Action No E.4.1 E.4.2 Action Monitor the growth of Microdictyon sp and Chaetomorpha sp as part of the SMP at the Paradise Marina and Pipers Creek sites to assess any possible impacts of overgrowth of seagrass Investigate the possibility of facilitating a ‘Dads navy’ in the Forster Keys and Pipers Creek area Indicative Cost Priority Responsibilities Progress Staff + Medium (D4) GLC volunteer time $2,000 Medium (D4) GLC, DPI Comments Typically the factor that most limits seagrass growth is light availability, whereas nutrient availability is the most limiting factor for macro-algae growth (Chaetomorpha sp and Microdictyon sp). As a result of this increases in nutrient availability favour macro-algae over seagrass growth, and this can lead to seagrass beds being overgrown and smothered by macro-algae. Interest has been expressed by residents in the Forster Keys area to form a ‘Dads navy’ to remove large mats of Chaetomorpha sp that regularly form in Forster Keys, Pipers Creek and Pipers Bay in the shallower water and smother seagrass beds. This idea is analogous to the ‘Dads army’ concept that involves volunteers devoting their time to weed control and bush regeneration projects on land. For a ‘Dads navy’ to harvest the Chaetomorpha sp the following steps would need to be taken: 1. gain support from the WLEMIC 2. obtain a permit from DPI to remove living macro-algae 3. receive training from DPI/GLC on macro-algae and seagrass identification to ensure only Chaetomorpha sp is removed, and identify and seek approval for an appropriate method for disposing the macro-algae. 44
Wallis Lake Estuary Management Plan [Plate 4.5: Chaetomorpha sp bloom in Pipers Creek 2001] Mather Island Godwin Island Breckenridge Channel Pipers Creek Forster Keys Big Island Pipers Bay [Figure 4.7: Sites of Chaetomorpha sp blooms in Pipers Creek and prolific Microdictyon sp growth in Breckenridge Channel] 45
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13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...

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